package org.foreningsgatan.modular.lightsources;

import java.util.HashMap;
import java.util.Map;

/**
 * 
 * Copyright (c) 2008 Joakim Back
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 * @author Joakim Back
 *
 */
public class SourceTables {
	class Entry {
		protected int range;

		protected RGB[][] rgbs;

		public Entry(LightSource source) {
			range = (int) Math.ceil(source.getRange());

			rgbs = new RGB[range * 2 + 1][range * 2 + 1];

			for (int y = -range; y <= range; y++) {
				for (int x = -range; x <= range; x++) {
					float intensity = Renderer.calcIntensity(x, y, 0, 0, source
							.getRange());

					RGB rgb = source.getSource().clone();

					rgb.multiply(intensity);

					rgbs[x + range][y + range] = rgb;
				}
			}
		}
	}

	private Map<LightSource, Entry> entries;

	public SourceTables() {
		entries = new HashMap<LightSource, Entry>();
	}

	public void prepare(LightSource source) {
		if (!contains(source)) {
			entries.put(source, new Entry(source));
		}
	}

	public boolean contains(LightSource source) {
		return entries.containsKey(source);
	}

	public RGB get(LightSource source, double dx, double dy) {
		Entry e = entries.get(source);

		return e.rgbs[(int) dx + e.range][(int) dy + e.range];
	}
}
